CVE-2020-7796: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2026-02-17. EPSS: 84.4% chance of exploitation in the next 30 days.

Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.

Affected products

• Synacor Zimbra Collaboration Suite: before 8.8.15 (fixed in 8.8.15); version 8.8.15 only

Published 2020-02-18. Last modified 2026-06-17.